基于DDS技术和FPGA的高精度任意波形发生器设计

DESIGN OF HIGH PRECISION ARBITRARY WAVEFORM GENERATOR BASED ON DDS TECHNOLOGY AND FPGA

为了解决传统信号发生器的信号频率精度不高、稳定性差和只能在较小范围内调节频率等缺点,本文利用直接数字合成技术,结合FPGA的IP核心优势,设计了一个可以产生任意波形的信号发生器。该信号发生器采用INTEL公司的飓风IV系列EP4CE6F17C8N为控制核心,并采用XMAL进行了前端界面设计,通过C#实现了逻辑处理界面的软件控制操作。该信号发生器具有波形单周期256点采样点、频谱分析明确、纯度占比高、精度高等特点,配合7阶巴特沃斯滤波器滤除高频信号,所产生的任意波形在示波器上显示效果很好。

In order to solve the disadvantages of the traditional signal generator,such as low frequency accuracy,poor stability and frequency adjustment only in a small range,combining with the IP core advantage of FPGA,a signal generator which can generate arbitrary waveform is designed on the basis of direct digital synthesis technology in this paper.The INTEL company’s Cyclone IV series EP4CE6F17C8N is used as the control core and the front-end interface design is carried out by XMAL.The software control operation of the logical processing interface is realized through C#.The signal generator has the characteristics of single cycle waveform with 256 sampling points,clear spectrum analysis,higher purity and high precision.The arbitrary waveform displayed on oscilloscope is wonderful after filtering out high frequency signal by seven order butter worth filter.